Means for securing railway-rails to concrete sleepers.



P. B. JAGGER.

MEANS FOR SECURING RAILWAY RAILS T0 CONCRETE SLEEPERS. APPLICATION FILED 050.13. 1910.

Patented Oct. 26, 1915.

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PETER BURD JAGG'ER, OF LONDON, ENGLAND, ASSIGNOR T0 QUEBEC SAVINGS AND TRUST COMPANY, OF MONTREAL, CANADA.

MEANS FOR SECURING ERAILWAY-RAILS 'TGGONCRETE SLEEPERS.

Specification of Letters Patent.

Patentedflet. as, rare.

Application filed December 13', 1910. Serial No. 597,188.

To all whom it may concern Be it known that 1, PETER Bum) Jnsonn, a subject of His Majesty'the King of England, residing at Garl-ton Studios, Carlton Vale, Maida Vale, London, England, have invented certain new and useful improvements in Means for Securing Railway-Rails I to Concrete Sleepers, of which the following is a specification.

This invention relates to the securing of railway rails to concrete sleepers.

The object of the present invention is to effect the securing of the rails in a more advantageous manner than heretofore by providing a reinforced concrete sleeper in which the walls of treenail holes extending there through have embedded therein spiral coils of metal, driving into the holes in the sleeper hollow treenails in the form of wooden or like plugs of such a size that they become laterally compressed from the outside inwardly by the concrete wall, and thereafter driving or screwing the usual metal bolts or spikes into the wooden plugs so that the latter become further compressed from the inside outwardly. In this way at one and the same time, the method aforesaid practically avoids any danger of loosening of the bolts or spikes by contraction of the plugs under great atmospheric changes of temperature and eliminates side play between the bolts or spikes and the holes in the rail flanges or chairs.

In the accompanying drawing, Figure 1 is a broken section through a sleeper and transverse to the rail showing the flange of the rail secured by spikes, and Fig. 2 is a section through a treenail.

Referring to the drawings, the sleper 1 is provided with suitable holes 2 reinforced by wire m embedded in the concrete. For the purpose of securing the bolts, screws or spikes 3 employed to fix the rail chairs, or the rails direct, the holes 2 are plugged with hollow plugs or treenails n of wood or the like material, into which the bolts, screws or spikes 8 may be screwed or driven. It is an essential feature of my invention that these plugs 1 should be made so that their external diameter is for a considerable portion of their length substantially greater than the diameter of the corresponding portion of the hole so that the wood is considerably compressed by the concrete wall when the plug is driven in. The diameter of the bore w is also such that the walls are strongly compressed from within when the bolts, screws or spikes are forced in. Fig. 2 shows such hollow plugs or treenails which are tapered downwardly and so proportioned in their cross-sectional area, that when driven into the holes in the sleeper, and the bolts or the like driven or screwed into the plugs, lateral compression from the exterior inwardly and vice versa, results to an extent practically avoiding any possibility of the holding down bolts ever becoming loosened by contraction of the plugs under great changes in atmospheric temperature. The coils m effectively relieve the concrete body of bursting strains set up by the fastenings and it is unnecessary to remove the sleeper to renew or replace a chair and (or) rail, since the holes are so made that the plugs themselves can be simply driven through into the track, assuming the nature of this permits. A further great advantage exists in that the displacement of the concrete body for fastening purposes is very small indeed.

Where the holes in the rail chairs or the rail plates l, Fig. 1, (when these are used) are of conical shape the upper ends 5 of the treenails or plugs n are correspondingly shaped. It will be understood that for joint sleepers, the seat portions thereof will be illustrating the amount of compression which I propose to employ the following is works well in practice. A hollow treenail or plug made of American oak of 1 inches pering to 1%,- inches outside diameter, and having a bore inch diameter, is used for a For driving into this hollow plug after it has been itself driven into the hole in the entering end tapered to inch diameter is used.

I claim and desire to secure by Letters Patent is ing railway rails on concrete sleepers, consisting of spiral coils of metal embedded in thin walled wooden sleeve adapted to be driven into the hole of the said sleeper and made correspondingly wider. As an example a description of a treenail which I find outside diameter, with its entering end tahole in the sleeper of 1%- inches diameter.

sleeper, a bolt of inch diameter with its Having thus described my invention what 1. The herein described device for securthe wall of a hole in the concrete sleeper, a

when so driven to be strongly compressed from the outside inwardly and a bolt 01 spike requiring to be forced into the said wooden sleeve so that when forced therein the. Wooden sleeve becomes further compressed from the inside outwardly thereby realizing a strong frictional grip on the bolt or spike.

2. The herein described device for securing railway rails on concrete sleepers, consisting of spiral coils of metal embedded in the Walls of holes in the concrete sleeper,

, thin walled wooden sleeves adapted to be driven, one to each said hole, into the holes of the said sleeper and when so driven to be strongly compressed from the outside inwardly and bolts or spikes requiring to be forced into the said wooden sleeves, one bolt or spike to each of said sleeves, so that when forced therein the wooden sleeves become further compressed from the inside outwardly thereby realizing a strong frictional grip on the bolts or spikes.

In testimony whereof I aflix my signature in presence of two witnesses.

PETER BURD JAGGER. Witnesses:

HENRY CONRAD I-IEIDE, ALBERT GEORGE BARNES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

7 Washington, D. G. 

